Ladder.



LA VERNE W NOYES.

LADDER.

APPLICATION FILED 0015.13, 1 913. 1,101,949, Patented June 30, 1914 h 77 I 8 I I a UNITED STATES PATENT sic.

LA VERNE W. NOYES, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE AERFIOTORCOMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

LADDER.

To all whom it may concern Be it known that I, LA Vnnnn WV. NOYES,citizen of the United States, residing at Chicago, in the county of Cookand State of Illinois, have invented a certain new and usefulImprovement in Ladders, of which the following is a. full, clear,concise, and exact description, reference being had to the accompanyingdrawings, forming a part of this specification.

My invention relates to ladders and has for one of its objects theconstruction of a ladder wherein a side-rail may be sectionally formed,and in which the side-rail sections are individual to the ladder rounds.Each composite unit comprising a side-rail section and a ladder round isformed of a single piece of iron rod having two portions bentsubstantially at right angles to each other, one portion constitutingthe round and the other portion constituting the siderail section. Theend of each side-rail section remote from the round integrally connectedwith such section is preferably formed with an eye in which is receivedthe outer end portion of the ladder round adj a cent this end, theladder thus including a series of interconnected angular links. Theside-rail of the ladder companion to the sectionally formed sideel'ailis integrally formed or unitary, the inner ends of the aforesaid ladderrounds being fixedly secured to the integrally formed side-rail, the

ladder rounds being preferably threaded at their ends adjacent theintegrally formed side-rail and passing through said latter side-rail soas to be clamped in engagement therewith by means of nuts applied to thethreaded ends of the rounds. The invention is not to be limitedL tothese preferred characteristics.

I have specifically embodied my invention in a construction in. whichtwo ladders formed as above described are located side by side with theadjacent integrally formed. side-rails in fixed relation to produce a.ladder more readily to accommodate both feet of the climber although theinvention is not to be limited to this double ladder formation.

I will explain my invention more fully by reference to the accompanyingdrawing showing the preferred embodiment thereof and in which Figure 1is a side levation of a portion Specification of Letters Patent. 7Patented June 30, 13914.

Application filed. October 13, 1913.

Serial No. 794,773.

of a ladder constructed in accordance with the invention; Fig. 2 isaside view of the structure shown in Fig. 1; Fig. 3 is a plan view on.line 3 3 of Fig. 1 on a larger scale;

Fig. 4 is a detail view on a larger scale on line a 4: of Fig. 1; Fig. 5isa view of a part of the structure as it appears in Fig, 1, on a largerscale; Fig. 6 is a sectional view on line 6 6 of Fig. 1; and Fig. 7

is a side view of the structure shown in Fig. 6 without the integrallyformed siderail and clamping nut.

Like parts are indicated by similar characters of reference throughoutthe different figures.

The ladder illustrated is a double ladder produced by the formation oftwo ladders side by side, these two ladders, respectively, includingintegrally formed unitary rigid side-rails .1, 2 which are brought intofixed relation by being constituted of the two sides of an angle iron,as illustrated most clearly in Fig. 3. The use of an angle iron tofurnish the connected integrally formed side-rails of a double ladderenables me to employ this same element as one of the inclined angle ironlegs of a tower which is so commonly supplied for supporting wind mills,tanks, etc. Each ladder of the double or composite ladder includes a'series of rounds 3, each provided with a shoulder or flange 4 near itsinner'en'd (Fig. 3) to engage the outer surface of its associateintegrally formed side-rail, the inner end of each round being threadedand deflected at right angles to its associate integrally formedside-rail so as properly to pass therethrough. This construction enablesthe application of a clamping nut 5 to the inner threaded end of eachround 8 to effect clamped engagement between the shoulder 4 of suchround and the associate inter grally formed side-rail. The outer end ofeach round 3 is merged with a unit 6 of the .s'ectionally formedside-rail, each of these The topmost unit of each ladder is preferablyof the formation illustrated most clearly in Figs. 6 and 7 the upper endof this topmost unit 6 being horizontally continued at 8, the horizontalcontinuation 8 having a shoulder or flange formation 9 near its innerend (Figs. 6 and 7) to engage the outer surface of its, associateintegrally formed side-rail, the inner end of each round being threadedand deflected at right angles to its associate integrally formedside-rail so as properly to. pass therethrough. This constructionenables the application of a clamping nut 10 to the inner threaded endof the extension 8 to effect clamping engagement between the shoulder 9of such extension and the associate integrally formed side-rail. Thetopmost unit of the sectional side-rail is thus fastened directly to theas sociate integrally formed side-rail, the flange 9, unlike the flanges4t, being flattened sulliciently to permit it to be passed through theeye of the unit 6 immediately beneath, in assembling the structure. Eachround and the sectional side-rail unit 6 merged therewith are desirablyformed of an iron rod, each eye '2' being located between the adjacentunit 6 and the integrally formed siderail and being in contact with suchadjacent unit, the whole structure being such that the sectionallyformed side-rail maintained in fined relation with the companionintegrally .tori'ned side-rail. It will be observed that the extension 8at the top of each. ladder takes part in supporting the load imposedupon each of the underlying rounds and that each round takes part insupporting the load imposed upon the rounds beneath, the force of theload being transmitted through the side rail sections 6 that intervenebetween the round 3 initially supporting the load and the rounds above.I believe it to be novel thus to distribute the load among the rounds,particularly when such distribution is effected by linked compositeunits each including a side rail section and a ladder round incombination with the rigid integrally formed side-rail that ultimatelysupports the sections of the sectionally formed side-rail through theintermediation of the ladder rounds individual to said sections.

It is obvious that the double ladder illustrated in the drawing is inthe form of two single ladders whose adjacent integrally termedside-rails 1 and 2 are merged as indicated. in Fig. 3 and the inventionis not therefore to be limited to the double ladder constructionillustrated nor is it to be limited to the precise details ofconstruction shown as changes may readily be made Without departing fromthe spirit of my invention.

jlNhere a double ladder formation is prov ded. the rounds 3 enteringlnto each may be made shorter than would be desirable in a singleladder.

Having thus described my invention I claim as new and desire to secureby Letters Patent the following 1. A ladder structure including twoconnected unitary side-rails formed of the sides of an angle iron;ladder rounds connected with each side-rail; and a second side-railcomplemental to each of the aforesaid side rails and including adjoiningconnected sectionsin its formation each individual to and 'itegrallyformed with a ladder round, sections of the sectionally formedside-rails terminating in eyes in which are received adjacent ends ofladder rounds individual to adjacent ladder rail sections.

2. A ladder structure including two connected unitary side-rails formedof the sides of an angle iron; ladder rounds connected with each.side-rail; and a second side-rail complemental to each of the aforesaidsiderai'ls and including adjoining connected sections in its formationeach individual to and integrally formed with a ladder round.

A ladder including a unitary side-rail; ladder rounds connected withsaid side-rail; and a second side-rail including adjoining connectedsections in its formation each individual to and integrally formed witha ladder round, sections of the second side rail terminating in eyes inwhich are re ceived the adjacent ends of ladder rounds in dividual toadjacent ladder-rail sections.

4t. A ladder including a unitary side-rail; ladder rounds connected withsaid side-rail; and a second side-rail including adjoining connectedsections in its formation each individual to and integrally formed witha ladder round.

In witness whereof, I hereunto subscribe my name this eighth day ofOctober A. D.,

LA VERNE W. NOYES. lVitnesses:

L. C. \VALKER, D. R. Scnonns.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents. Washington, D. C,

